Almost everyone of these claims of sighting mentioned that there were patches of clouds. This phenomenon is the perfect reason for sighting of such marginal and thin crescents with the naked eye which will not be visible if skies were clear of any clouds.
The calculations for the Visibility curves are for clear sky. However, if the sky is covered by patches of clouds here and there, then they block a lot of scattered sunlight in the sky, and if there is an opening of clouds where the moon is, then this moon would be visible, because the background sky light is not as bright as it is usually in the clear skies. This phenomenon has been observed in the past by myself and others, for those areas where the sighting was possible by telescopes, the moon can be seen with the naked eye, under these circumstances. Photos were taken at Bukit Shahbandar, Jerudong.
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